Creating Inner Classifiers

Open the Inner Classifiers tab in the property sheet of a class or interface, and click the Add inner class or Add inner interface tool.

Right-click a class or interface in the Browser, and select New > Class or New > Interface

Select the Inner Link tool in the Palette and click and use it to connect two classes in the diagram. The first class will become a composite class and the second, an inner classifier

Create a composite classifier diagram dedicated to the class (see following section), and create classes or interfaces there.